(display "\n========================================\n")
(define x (list 1 3 (list 5 7) 9))
(define y (list (list 7)))
(define z (list 1 (list 2 (list 3 (list 5 (list 6  7))))))
(display x)
(newline)
(display y)
(newline)
(display z)
(newline)

(display (car (cdr (car (cdr (cdr x))))))
(newline)
(display (car (car y)))
(newline)
(display (car (cdr (car (cdr (car (cdr (car (cdr (car (cdr z)))))))))))
(display "\n========================================\n")
